Cushion-tire.



IIIIIIIIIII APPLICATION FILED APR. 16. 1909:

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WILLIAM E. transits-o, or woaons'rnn, MASSACHUSETTS, assrenos or ONE-HALF TO Jenn n. rnoULx, or sou'rnnnrnen, MASSACHUSETTS.

To allauho-m it may concern:

durable than the cushion tires heretofore made.

To this end the invention comprises a rubber 'tire which is rovided with what may be termed an annu ar two-chamber opening, the chambers 'being' arranged to diverge from eacli'other leaving between them, in the line of the reatest applied pressure, an annular, inwardly extending projection or ridge which is preferably supported by an annular brid e-piece which is introduced into the charm er of the tire-after the body,

of'the latter has been molded, and which, when introduced into said chamber, divides the latter into thetwo chambers or parts above referred to.

In the accompanying drawings Figure l is a cross section of the body portion of the improved tire, Showing the form, in cross section, in which it is first molded, and Fig. 2 is a similar View with the annular bridge piece introduced into the chamber of the tire.

Referring to the drawings, A' denotes the body ofthe tire which is provided with at taching portions of any construction Isuitable for connection with the rim of a wheel. These attaching portions a may have molded into them strengthening or stiffening rings a of hard rubber, as is customary. In molding the tire A it is formed with a chamber 13 having diverging portions 6 divided byan inwardly projecting portion or, ridge 0.

The inner part of the chamber B, after the body of the tire has been molded, is partly filled by a supporting bridge-piece 1) the inner part of said bridge-piece closely fittin the inner part of the chamber l3, and sai bridge-piece being provided w th an annular recess or groove at its outer edge for the reception of the annular ridge-por- Specification bf Letters Patent.

- Application filed. April 16,1809. Serial No. 490,374.

cus rron 'rmn.

chambers 6' form inward continuations of the diverging chambers b.

As itwould be impossible to mold a tire with the diverging openings or chambers a 7), b, excepting by first making the tire with the opening Band the slit E, itbecomes necessary, after the tire has been molded, and to afford the requisite resistance to the weight or pressure on the tire, to partly fill Patented Nov. 9, 19th,

the space B with the annular bridge-piece D which is inserted into the tire by spreading or forcing a )art the split inner portion of the same,'an

then forcing the said annular bridge-piece into the chamber B.

It will. be observed that the divergin openings I) extend outwardly at an .angc to the central portion oi 'the tread of the tire, or to the direction of the pressure which will be brought upon the tire when the same is 1n use, and which direction is denoted by the arrow iii-Fig. 2; so thatv while these openings contribute to a proper resilience or elasticity of the tire and render the latter capable of the requisite .vibration The tire cannot therefore flatten in the manner' in which an ordinary cushion tire, with a central annular chamber, docs, and WllHll flattenlng renders the tire comparatively short-lived, in that, after comparatively little, use it is liable to break at the edges of the flattened portiom "But a tire which is' constructed in accordance with this in vention will be practically as long-lived a solid rubber tire, in that it will not flatten in the manner an ordinary cushion tire does, While it will have the resiliency or elasticity of a cushion tire. Having thus described my invention 1 claim and desire to sccureby Letters Patent: 1. An elastic cushion rubber tire having continuous annular diverging chambers extending outwardly at an angle to the line of pressure on the tire, or to the tread thereof, and divided by an annular inwardly'projccting portion or ridge, said tire having at with the entrance to said chambers and said lire including a solid brideeaiieceof elaaliic material arranged in its inner portion between raid i' hanibers, but not filling the laiter, and .in engagement with the said in- 1 nular groove at its outer part to receive the 3 said inwardly projectin; portion or ridge (l, and the base or attaching portion of said against" the applied presxure, but. leaving I said direrginn' chambers unfilled with solid wardly projecting portion or ridge, thus $(,]'\'1ll to brace the lreadporlion o! the tire material.

2. An elastic rubber cushion tire having;-

divergingannular chambers I), an inwardly projecting portion or ridge i dividing sald,

chambers, an annular chamber ll, a bridgenecc .l) closely titling lhe HHHI' part of said or chambers I) communicating with Filld chambers I), said bridge-piece having an anlire being provided with a slit E.

In testimony whereof I alhx my signature, in presence of two witnesses.

WILLIAM F. M All 161V :0.

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